Introduction: As seasonal turbidity is one of the major challenges in drinking water supply consequently, take an appropriate method to provide standards range is necessary. This study aimed to determine the effect of Snail shell as a coagulant aid in the removal of turbidity in aqueous environments using electrocoagulation process through aluminum electrodes.

Methods: This experimental study was investigated at the laboratory scale. The used reactor had a volume of 1 liter whit four aluminum electrodes as a cathode and anode in the form of a direct current power supply. Effects of pH (9-6), initial concentration of turbidity (200 NTU to 800 NTU), reaction time (30 -10 min), the concentration of Snail Shell (0.5-4.5 mg/L) and the potential difference (10-40 V) were examined.

Results: The findings indicated that the best performance for turbidity removal obtained at pH 8, reaction time 30 min, potential difference of 40 V, SS 2 mg/L dose of coagulant aid concentration and turbidity 200 NTU.

Conclusion: The results suggest that Electrocoagulation process using aluminum electrodes have good performance for removal of high concentration of turbidity and snail shell coagulant aid is a good option to improve the performance of the electrocoagulation process.